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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<pre><span class="sourceLineNo">001</span>package org.junit.rules;<a name="line.1"></a>
<span class="sourceLineNo">002</span><a name="line.2"></a>
<span class="sourceLineNo">003</span>import org.junit.runner.Description;<a name="line.3"></a>
<span class="sourceLineNo">004</span>import org.junit.runners.model.Statement;<a name="line.4"></a>
<span class="sourceLineNo">005</span><a name="line.5"></a>
<span class="sourceLineNo">006</span>/**<a name="line.6"></a>
<span class="sourceLineNo">007</span> * A base class for Rules (like TemporaryFolder) that set up an external<a name="line.7"></a>
<span class="sourceLineNo">008</span> * resource before a test (a file, socket, server, database connection, etc.),<a name="line.8"></a>
<span class="sourceLineNo">009</span> * and guarantee to tear it down afterward:<a name="line.9"></a>
<span class="sourceLineNo">010</span> *<a name="line.10"></a>
<span class="sourceLineNo">011</span> * &lt;pre&gt;<a name="line.11"></a>
<span class="sourceLineNo">012</span> * public static class UsesExternalResource {<a name="line.12"></a>
<span class="sourceLineNo">013</span> *  Server myServer= new Server();<a name="line.13"></a>
<span class="sourceLineNo">014</span> *<a name="line.14"></a>
<span class="sourceLineNo">015</span> *  &amp;#064;Rule<a name="line.15"></a>
<span class="sourceLineNo">016</span> *  public ExternalResource resource= new ExternalResource() {<a name="line.16"></a>
<span class="sourceLineNo">017</span> *      &amp;#064;Override<a name="line.17"></a>
<span class="sourceLineNo">018</span> *      protected void before() throws Throwable {<a name="line.18"></a>
<span class="sourceLineNo">019</span> *          myServer.connect();<a name="line.19"></a>
<span class="sourceLineNo">020</span> *         };<a name="line.20"></a>
<span class="sourceLineNo">021</span> *<a name="line.21"></a>
<span class="sourceLineNo">022</span> *      &amp;#064;Override<a name="line.22"></a>
<span class="sourceLineNo">023</span> *      protected void after() {<a name="line.23"></a>
<span class="sourceLineNo">024</span> *          myServer.disconnect();<a name="line.24"></a>
<span class="sourceLineNo">025</span> *         };<a name="line.25"></a>
<span class="sourceLineNo">026</span> *     };<a name="line.26"></a>
<span class="sourceLineNo">027</span> *<a name="line.27"></a>
<span class="sourceLineNo">028</span> *  &amp;#064;Test<a name="line.28"></a>
<span class="sourceLineNo">029</span> *  public void testFoo() {<a name="line.29"></a>
<span class="sourceLineNo">030</span> *      new Client().run(myServer);<a name="line.30"></a>
<span class="sourceLineNo">031</span> *     }<a name="line.31"></a>
<span class="sourceLineNo">032</span> * }<a name="line.32"></a>
<span class="sourceLineNo">033</span> * &lt;/pre&gt;<a name="line.33"></a>
<span class="sourceLineNo">034</span> *<a name="line.34"></a>
<span class="sourceLineNo">035</span> * @since 4.7<a name="line.35"></a>
<span class="sourceLineNo">036</span> */<a name="line.36"></a>
<span class="sourceLineNo">037</span>public abstract class ExternalResource implements TestRule {<a name="line.37"></a>
<span class="sourceLineNo">038</span>    public Statement apply(Statement base, Description description) {<a name="line.38"></a>
<span class="sourceLineNo">039</span>        return statement(base);<a name="line.39"></a>
<span class="sourceLineNo">040</span>    }<a name="line.40"></a>
<span class="sourceLineNo">041</span><a name="line.41"></a>
<span class="sourceLineNo">042</span>    private Statement statement(final Statement base) {<a name="line.42"></a>
<span class="sourceLineNo">043</span>        return new Statement() {<a name="line.43"></a>
<span class="sourceLineNo">044</span>            @Override<a name="line.44"></a>
<span class="sourceLineNo">045</span>            public void evaluate() throws Throwable {<a name="line.45"></a>
<span class="sourceLineNo">046</span>                before();<a name="line.46"></a>
<span class="sourceLineNo">047</span>                try {<a name="line.47"></a>
<span class="sourceLineNo">048</span>                    base.evaluate();<a name="line.48"></a>
<span class="sourceLineNo">049</span>                } finally {<a name="line.49"></a>
<span class="sourceLineNo">050</span>                    after();<a name="line.50"></a>
<span class="sourceLineNo">051</span>                }<a name="line.51"></a>
<span class="sourceLineNo">052</span>            }<a name="line.52"></a>
<span class="sourceLineNo">053</span>        };<a name="line.53"></a>
<span class="sourceLineNo">054</span>    }<a name="line.54"></a>
<span class="sourceLineNo">055</span><a name="line.55"></a>
<span class="sourceLineNo">056</span>    /**<a name="line.56"></a>
<span class="sourceLineNo">057</span>     * Override to set up your specific external resource.<a name="line.57"></a>
<span class="sourceLineNo">058</span>     *<a name="line.58"></a>
<span class="sourceLineNo">059</span>     * @throws Throwable if setup fails (which will disable {@code after}<a name="line.59"></a>
<span class="sourceLineNo">060</span>     */<a name="line.60"></a>
<span class="sourceLineNo">061</span>    protected void before() throws Throwable {<a name="line.61"></a>
<span class="sourceLineNo">062</span>        // do nothing<a name="line.62"></a>
<span class="sourceLineNo">063</span>    }<a name="line.63"></a>
<span class="sourceLineNo">064</span><a name="line.64"></a>
<span class="sourceLineNo">065</span>    /**<a name="line.65"></a>
<span class="sourceLineNo">066</span>     * Override to tear down your specific external resource.<a name="line.66"></a>
<span class="sourceLineNo">067</span>     */<a name="line.67"></a>
<span class="sourceLineNo">068</span>    protected void after() {<a name="line.68"></a>
<span class="sourceLineNo">069</span>        // do nothing<a name="line.69"></a>
<span class="sourceLineNo">070</span>    }<a name="line.70"></a>
<span class="sourceLineNo">071</span>}<a name="line.71"></a>




























































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